Felt paper



UNITED STATES PATENT OFFICE.

CLARENCE P. COWAN, OF PONT ROUGE, QUEBEC, CANADA, ASSIGNOR TO CHARLES S.BIRD, OF WALPOLE, MASSACHUSETTS.

FELT PAPER.

No Drawing.

To all whom it may concern:

Be it known that I, CLARENCE P. CowAN, a citizen of the Dominion ofCanada, residing at Pont Rouge, in the Province of Quebec, Dominion ofCanada, have invented certain new and useful Improvements in Felt Paper,of which the following is a specification.

This invention pertains to an improved felt paper, and has for itsobject the production of a material which is comparatii'ely light inweight and at the same time porous, the paper being especially adapted,by reason of its porosity, and open fiber, for use in the manufacture ofroofing felt.

The life and quality of roofing felt are dependent, to a great extent,upon the degree of saturation which may be effected, and a felt made upas hereinafter set forth may be readily and thoroughly saturated orimpregnated.

I have found that the employment of peat moss, of the speciesDrepamocladus Knez'jfii (Sch) Varnst, which is quite abundant in certainCanadian Provinces, is very desirable in the production of an open,porous stock. Such material in quantities of, for instance, from 15% to20%, is combined with rags, say, 60%, and mixed papers, or foldednewspapers, as the case may be, to the extent of from 20% to 25%.

The moss in its natural state, is placed in a heater, with the otheringredients, and beaten up in accordance with the usual practice. Asheet formed from the stock which results from such operation will, as.above set forth, be found to be highly open and porous, and will take upmost readily the impregnating material which is employed, such, forinstance, as asphalt. Furthermore,

Specification of Letters Patent.

Application filed July 16, 1918.

Patented Jan. 20, 1920.

Serial No. 245,228.

but a slight expenditure of power is required to get the moss intoproper condition for making the paper. In addition to this advantage,the moss adds very much to the thickness of the felt for a given weight.

Again, the use of the moss materially lengthens the life of the paper orfelt, as it does not readily decompose with age.

While I have specified certain proportions as producing the bestresults, I do not desire to be limited thereto, as the amount of mossemployed, in relation to the other component elements, may be varied,depending, of course, upon the degree of porosity desired and the weightof the felt for a given thickness thereof.

Having thus described my invention, what I claim is:

1. Felt stock, composed of a. mixture of disintegrated peat moss, ragsand paper.

2. As a new article of manufacture, felt paper composed of disintegratedpeat moss, rags and paper, the moss being present to the extent of atleast 15%, with the rags in excess of the paper.

3. As a new article of manufacture, felt paper composed of from 15% to20% disintegrated peat moss, 20% paper, and 60% rags.

4:. As a new article of manufacture, felt paper suitable for roofingpurposes, composed of a mixture of disintegrated peat moss, rags andpaper, said paper being impregnated with asphalt.

5. A prepared roofing comprising a felt containing disintegrated peatmoss Waterproofed with a bituminous substance.

In testimony whereof I have signed my name to this specification.

CLARENCE P. COWVAN.

